rossum



C. A. AND 0. F. ROSS'UM.

CABBURETER.

APPLICATION FILED JAN. 8. 1917.

1,304,205. Patented May 20, 1919.

2 SHEETS-SHEET I VITN ESSES C. A. AND O. F. ROSSUM.

CABBURETER.

APPLICATI'O?! FILED mu. 8. 151.

2 SHEETSSHEET 2.

Patented May 20, 191v.

UNITED STATES PATENT OFFICE.

CARL ALBERT nossum an oscan rnnnnnrx nossum, or WINNIPEG, MANITOBA,

CANADA.

cmrunn'rnn.

Specification of Letters Patent.

Patented May 20, 1919.

To all whom it may concern:

Be it known that we, CARL ALBERT Ros-.

sour and OSCAR FREDERIK RossUM, both of the cit of Winnipeg, in theProvince of Manito a, Canada, have invented certain new and usefulImprovements in Carbureters, of which the following is thespecification.

The invention relates to improvements 1n carbureters as used withinternal combustion engines wherein a distillate such .as gasolene orkerosene is used as the fuel and the principal object of the inventionis to provide a carbureter in which the eflicient vaporizing of thefuel'by direct heating can be had as it isbeing mixed with air therebyproviding a highly eflicient firing mixture for the engine. v

A further object is to arrange the carbureter such that the externalheat utilized for vaporizing the fuel will act over a comparativelylarge area and thereby not only efiiciently vaporize the fuel but alsoaccomplish vaporization quickly.

A still further object is to provide the carburetor with a speciallyconstructed air valve adjustably mounted so that it can be regulated toinsure a constant firing mixture at all speeds.

With the above objects in view the invention consists essentially in thearrangement and construction ofparts hereinafter more particularlydescribed and later pointed out in the appended claim, referencebeing'had to the accompanying drawings in wh1ch:-

' Figure 1 represents a plan view of the complete carburetor.

F1g. 2 a vertical sectional v1ew longitudinally through the same.

Fig. 3 an end view of the carburetor, part bein shown in verticalsection. the section passing. longitudinally through the float chamber.

Fig. 4 represents a perspective view of the exhaust gas tube and thesurrounding stationary tube forming between them an annular chamber.

Fig. 5 represents a perspective view of the adjusting tube.

Fig. 6 represents a perspective view of the adjusting sleeve an lever.

In the drawings like characters of reference indicate correspondingparts in the several figures.

The carburetor body is atwo-part one, be-

ing formed from an upper casting 2 and a lower casting 3 suitably boltedtogether as indicated at 4 through lugs provided.

The lower casting is designed to provide a shortinlet air pipe 5, avalveseat 6, an upstanding interiorly screw threaded boss 7 centered belowthe valve seat, a crosswise extending float chamber 8 communicatingthrough an outlet duct 9 with the bottom ,of the casting and providedwith an. en

trance opening 10 for the fuel and an intewith the air pipe as indicatedat 12 around the outletduct 9 and terminates in an upwardly extendingchoke tube 13 located at the opposite side of the casting to the airinlet pipe 5.

The top casting is arranged to present an interior mixing'chamber 14which communicates' with the tube 13 at the one end and with the airpipe 5 at the other end, this latter passage being eifected through the'airfloat simply operates to control, the admission through the needlevalve to the float chamber of the distillate or fuel such as gasolene orkerosene. Obviously upon the level of the liquid in the float chamberlowering the float willv cause the needle valve to rise which willadmit-of the inflow of further liquid to the float chamber, it beingunderstood that the inlet opening is in direct rior air passage. 11which communicates communication with a reservoir or other source ofsupply.

To the base of the under casting 3 we bolt a special base plate 20having an interior duct 21 therein communicating with the duct 9 andprovided further with an upstanding tube 22 which is'inserted throughthe bottom of the casting 3 and extend upwardly centrally within thetube 13 of said casting. The upper end of the tube 22 terminatesadjacent the contracted or choking portion 13 of the tube 13 and has theupper end'thereof coned out as indicated at 23.

To the underside of the base plate we fasten a vertically extendingexhaust gas tube 24 which passes upwardly through the carbureter fromtop to bottom and extends in passage through the tube 22, there being anannular reservoir between these tubes as indicated 'at 25.

The upper end of the gas tube is supplied with an elbow 26 whereby itcan be readily connected to the exhaust gas pipe of the engine, whilethe exit from the lower end of the said tube is controlled by a valve27.

From the above arrangement it will be obvious that the fuel in the floatchamber is free to pass directly through the ducts 9 and 21 to theannular chamber 25 formed between the tubes 22 and 24.

The upper casting 2 carries an adjusting tube 28 which surrounds thetube 24, has-the upper end thereof screw threaded into the casting andfitted with opposing pairs of notches 29 and the lower end thereofadjacent the upper end of the'tube 22 coned as indicated at 30 in theopposite direction to the coned end 23 of the latter tube.

An adjusting sleeve 31 is mounted on the upper end of the tube 28 and issupplied with outstanding wings 32 and a lever 33, these being arrangedto fit into the notches 29 hereinbefore described.

The above arrangement is such that one can by swinging the lever screwthe tube 28 up or down and effect the enlargement or contraction of theoutlet passage 34 appearing between the coned ends of the tubes 22 and28 which passage, it will be noted, forms the only connection for thefuel between the annular passage 25 and the upper end of the tube 13.

35 represents a spindle passing downwardly through the carburetor andhaving the upper end thereof fitted with a knob or finger piece 36 andthe lower end thereof screw threaded into the boss 7.

' 37 represents a sleeve mounted on the upper end of the spindle andscrew threaded as indicated at 38 through the top of the upper casting.The threads of the sleeve are directly opposite to the threads of thespindle, that is to say, if the threads of the spindle be right hand,then those of the sleeve are left hand. The sleeve is supplied at theupper end with a head 39 interiorly boredto receive a spring pressed dog40 which rides on the face of the spindle and is adapted to engage withone or other of longitudinally disposed slots 41 provided in the face ofthe spindle.

The edge of the head is notched as indicated at 42 and such notches areengaged by a pressure spring 43 bolted at 44 to the top casting.

'45 is an air valve normally seated on the seat 6 and slidably mountedon the spindle.

46 and 47 are a pair of cups mounted on the spindle at opposite sides ofthe valve, the cup 46 abutting the lower end of the sleeve 38 and beingheld in this position by an inserted coiled spring 48 set on the topside of the valve, while the cup 47 is seated against a pair of locknuts 49 being held against them by an inserted coiled spring 50 havingthe upper end engaging the underside of the valve.

The above arrangement allows of a very fine adjustment of the valve asthe tension in the springs can be adjusted as desired and in thefollowing way If one turn the head of the sleeve 37, the spring 43 willclick past the notches 42, while the dog 40 will remain in the slot 41and the result is that the sleeve in screwing up or down will effect amovement in the spindle and owing to the opposite threading of thesleeve and spindle will cause the cups to simultaneously draw togetheror spread apart to increase or decrease the tension of the springs atopposite sides of the valve.

On the other hand, if one hold the spindle and turn the head of thesleeve or vice versa he can effect an independent adjustment of the topor bottom spring on the valve.

The large range of adjustment possible with this construction of valveinsures proper control of the air flow and consequently a proper firingmixture at all speeds.

The outlet pipe 15 and the inlet pipe 5 are provided with throttlevalves 51 and- 52 which can be regulated as desired.

When the carbureter is operating at low speeds the air entering throughthe pipe 5 passes directly to the tube 13 where it is mixed with thevapor escaping from the passage 34, the mixing of the vapor with the airtaking place at the contracted part of the tube. Afterward the mixturepasses up throu h the outlet pipe 15 to the intake mani old of theengine.

The fuel admitted to the chamber 25 is vaporized positively andeffectively by the hot exhaust gases passed downwardly through the tube24 and controlled by the valve 27 As the engine gains speed the valve 45automatically 0 ens and allows auxiliary air to pass direct y into themixing chamber so that a more lean mixture is passed to the manifoldthan where the engine is running at low speeds and requires a richmixture such as is passed up through the upper end of the tube 13.

What we claim as our invention'is:

In a carbureter, the combination with an air inlet passage, a mixingchamber and a source of liquid fuel supply, of a contracted choke tubeconnecting the air passage with the mixing chamber, an exhaust gas tubepassing through the carbureter and extending through the choke tube, anupstanding outer tube surrounding and spaced from the lower end of theekhaust gzis tube and providing a fuel intake assage communicating withthe source of f'ue supply, said outer tube having the upper end thereofinward-1y coned and terminating adjacent the contracted port-ion of thechoke tube, an adjusting tube 28 adjustably mounted in the upper portionof the carbureter and surrounding the upper portion of the exhaust gastube and havm the lower end thereof outwardly coned an spaced from theinner end of the upstanding outer tube and providing an adjustable fueloutlet passage to the interior of the choke tube, an adJustable sleevemounted on the upper end of the tube 28, and an adjustable 15 valvelocated at the lower end ofthe ex haust gas tube.

Signed at \Vinnipeg, this 13th day of December 1916.

CARL ALBERT ROSSUM. OSCAR FREDERIK ROSSUM. In the presence of- G. S.ROXBURGH, ROLAND 'FOSTER.

copies at thin potent my be obtained (or he cents each, by addressingthe "fiommiuioner of l'atentl.

'uhhgton, D. 0.

